Need help understanding dpdt relays?

This is my first time building a circuit which includes a power dpdt relay. Could someone please explain what do coil voltage, turn on voltage (max), and turn off voltage (min) mean? For example, this one particular dpdt relay that I saw online has coil voltage, turn on voltage, and turn off voltage ratings at... show more This is my first time building a circuit which includes a power dpdt relay. Could someone please explain what do coil voltage, turn on voltage (max), and turn off voltage (min) mean? For example, this one particular dpdt relay that I saw online has coil voltage, turn on voltage, and turn off voltage ratings at 24VDC, 18VDC, 2.4VDC, respectively.

thanks for answering
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